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HT FREQUENCY SETTING?

M

MrGrim257

Banned
Could someone explain to me what the HT Frequency setting in my bios actually does for performance? Right now it defaults to 4x, which I assume is 800mhz. Should I set it to 5x? I just put this machine together this past weekend, and soon plan to see how much of an OC I can get out of it. Will HT Frequency affect OC stability?

Thanks
 
The HT or HyperTransport frequency is basically the Front Side Bus speed of the Athlon 64. Since the nForce 3 250 increased it to 1000, it will increase performance. I'm not sure if you have to have DDR500 RAM to run it at 1000 (5X), but you could set it to that and see what happens.
 
Originally posted by: darkswordsman17
The HT or HyperTransport frequency is basically the Front Side Bus speed of the Athlon 64. Since the nForce 3 250 increased it to 1000, it will increase performance. I'm not sure if you have to have DDR500 RAM to run it at 1000 (5X), but you could set it to that and see what happens.
Click to expand...

I have Kingston HyperX PC4000, so I should be able to handle it. Is it tied directly to the FSB setting of my processor? If thats the case, increasing it to 5x would amount to a significant overclock. Would increasing it to 5x only take affect if I adjust the FSB speed of my processor, or would it override the FSB setting in the bios? Could someone please clarify.
 
Memory reads and writes do NOT go over HyperTransport. Lots of people say that HT = FSB, but that's not technically correct. The A64 talks directly to the memory, it does not use the northbridge. So your HT speed is independant of your memory thoughput. You will almost certainly not be able to tell a difference between 800Mhz and 1Ghz HT. 800Mhz already offers more bandwidth than most systems need.
 
Originally posted by: sisooktom
Memory reads and writes do NOT go over HyperTransport. Lots of people say that HT = FSB, but that's not technically correct. The A64 talks directly to the memory, it does not use the northbridge. So your HT speed is independant of your memory thoughput. You will almost certainly not be able to tell a difference between 800Mhz and 1Ghz HT. 800Mhz already offers more bandwidth than most systems need.
Click to expand...

That clears it up sisooktom, Thanks
 
Yeah, sisooktom, thats more correct. I knew that HT wasn't actually the same as FSB. I was thinking though, that the HT was the direct connection the memory on A64s.

If you run DDR400/PC3200 then you'll have an effective FSB of 1600mhz right? Would running DDR500 with a 1000mhz HT allow for a FSB of 2000mhz?
 
I haven't had the opportunity to play with a nF3 250 based board yet *I'm waiting for more real 250GB boards to hit the shelves* but if it's anything like the 150 for overclocking you'll have to drop the HTT/LDT multi and boost it's voltage to get a good overclock.
 
If you want to do overclocking, you'll be looking to drop the HT multiplier to 3x, not raise it to 4x. There's an article on s754 OCing at HardOCP right now you could have a look at. They had some pretty good results with the new VIA chipset and a 'soon to be released' BIOS update.
 
A good idea would be to read through Anandtech's article reviewing the new nForce 3 250 boards. In the article they try overclocking all of them and give their results. I believe they also say how they set them up to achieve the best overclock with each board.

Article

Here ya go, this is what you're looking for.
 
Originally posted by: darkswordsman17
If you run DDR400/PC3200 then you'll have an effective FSB of 1600mhz right? Would running DDR500 with a 1000mhz HT allow for a FSB of 2000mhz?
Click to expand...

No. Keep in mind that DDR400 RAM only actually runs at 200Mhz. It's only the effective speed that is 400Mhz, because data gets transferred twice each clock cycle. The HT speed has nothing to do with your memory speed.
 
Ok, I'm suddenly realizing I don't know the A64 stuff much.

I was thinking that they ran at 1600mhz and now 2000mhz FSBs.

So, HT has nothing to do with that.

I'll probably go do some reading about A64 to clear up my misunderstanding.
 
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